Chimney top



K. KRQEBIG CHIMNEY TOP April 17, 1934 fFiled Jan. 24, 1950 duo; n e 1.

Patented Apr. 17, 1934 l,%d,8?7

nivirso STATES eersnr @FFEQEV CHIMNEY TOP Karl Kroebig, Milwaukee, Wis.

Application January 24, 1930, Serial No. 423,073

3 Claims. (01. 9866) This invention relates to chimney tops. channel 4 from spreading laterally and the wind The chimney top to which the invention applies pressure upon that channel causes the air therein in particular is employed to increase the draft to move upwardly at an increased. rate as the of a chimney and has a flue which forms an exchannel narrows and to pass over the top of the 5 tension of the chimney flue. wall 1 with sufficient force to deflect the horito An object of the invention i to incre the zontally moving currents of air and create a low draft of a chimney and to prevent down drafts pressure area at t l of the e therein irrespective of the direction of the wind If the C mney is located. adjaee t a high S cor the proximity of adjacent structures. ture, So a the Wind deflected hereby would A oth r bjeet i t di t rr t of i upordinarily cause down drafts in the chimney, the co wardly and ever t flue air deflected upwardly in the channels 4 has Another object is to provide a chimney top sufficient force to overcome such down drafts and which may be readily and economically manumaintain the draft of 1'lhe yf t ed and i t ll d The chimney top may also be provided with According to the invention, the outside of the secondary c a 5 which are formed in the it chimney top is provided with inclined channels top of the Wall 1 to direct small currents o Jets to direct currents of air upwardly and over the OI" air upward y into the p f h flue 2. upper end thereot The wind pressure upon the air in a channel 4 Th hi n t may ,1 b provided t causes air to move through the small secondary small channels to direct currents of air upwardly Channels 5 a a r l tively high speed and ma- 75 and t t top of t flue terially assist in maintaining the draft of the Chimney tops embodying the invention are himney. shown in the accompanying drawing in which The wind deflectors 3 adj nt each corner of t views are as r n the chimney top are joined to each other by an Fig. 1 is a top plan View of a chimney top; arcuate face 6 and form a shallow channel 7 Fig. 2 is an elevation of the chimney top shown thereh'e'fiween Which Slopes p y d in Fig, 1; and wardly to direct a current of air upwardly and Fig. 3 is a central vertical section of a chimney v t e corners of the flue 2. top embodying a modification of the invention, The channels 7 assist the channels 4 in direct- The chimney top has a continuous side wall 1 i s Currents of air Ov e top of the flue 2 which normally rests upon the top of a chimney Whenever the W is not blowing q y into a and provides a flue 2 in alinement with the flue cha nel 4. of the chimney and forming an extension thereof. Th chimney t p a been Shown as being If the chimney is provided with a flue lining, rectangular in cross-section, but the invention is the same extends into the flue 2 and holds the not limited to that specific form and is susceptible chimney top against lateral movement, as shown of various modifications without departing from in dotted lines in Fig. 3. the scope thereof as hereafter claimed.

The chimney top is preferably made from The invention is hereby claimed as follows: moldable material, such as concrete, and may 1. A draft increasing chimney cowl, compris- 40 consist of a single unit, as shown in Fig. 2, or ing a body having the shape of a frustrum of a be formed of interlocking sections, as shown in pyramid provided with a flue extending there- Fig, 3 through, two wind deflectors formed upon each The side wall 1 is thicker at the bottom than side wall of said py perpendicular ereto at the top, and the outer faces thereof slope and converging inwardly toward the top formupwardly and. inwardly to deflect horizontal curins n p y and inwardly ine1ined nv r rents of air upwardly and over the top of the ing channel therebetween to turn the wind and flue 2. direct an accelerated current of air upward over Each of the outer faces of the wall 1 is prothe flue, and a secondary channel formed in the vided with two wind deflectors 3 which converge top of each side wall and inclined inwardly and i toward the upper end of the chimney top and upwardly to deflect a jet of air from the main form a channel 4 between the same. channel across the top of the flue in upwardly in- The outer edges of the deflectors 3 are vertical, clined direction to increase the draft through the so that the channel 4 is both deeper and narrower flue. at the t p a at the t m r 2. A chimney top rovided with a pyramidal 55 The wind deflectors 3 prevent the air in a t ri r nd having flue extending the? ing a channel extending therethrough on the edge thereof adjacent the vertex of said pyramidal exterior having a slope slightly greater than said side and forming a means to direct air over said flue, a plurality of deflectors arranged on the sides of said pyramidal exterior to direct air over said flue and through said channel.

KARL KROEBIG. 

